立井揭煤抽排瓦斯布孔的几何模型及其可视化

A geometric model and the visibility of the gas drainage drilling in the subvertical coal exploitation

为了准确、快速地得出不同巷道与煤层位置关系下立井揭煤抽排瓦斯钻孔参数,绘制其可视化图形以直观地指导煤矿立井揭煤抽排钻孔的施工,采用解析几何的方法建立立井揭煤抽排瓦斯钻孔参数计算模型,并用AutoCAD中的可视化方法建立三维巷道、钻孔及煤层的可视化模型,然后用VBA编程,设计出便于输入不同条件的用户窗体,通过运行程序求得钻孔布置参数,绘制可视化图形。结果表明,得出的图形及设计参数与实际较为接近。

The purpose of this paper is to introduce a geometric model of gas drainage drilling for subvertical coal-mine exploitation, so as to be able to work out the drilling parameters fast and accurately in accordance with its visibility and the geodynamic prospect features. In so doing, it is in eventual analysis oriented to provide a guidance for drilling the subvertical coal mine efficiently and effectively. In our model, we have chosen the exploitation layout in a rectangular drilling sphere. According to the rule of abandoning the drilling plot, we have decided to give up the abandoned part and plan to finally build up a geometric model by deducing the drilling coordinating formulas of workhead and back to the coal seams and other formulas needed for the drilling work. The model of ours can help to work out the drilling length in the front and at the back of the coal seams, the dip angle of drillings, the layout range of the back of the coal seam, the row and column spacing of drillings at the workhead, the amount of all the drillings, as well as other layout parameters under different conditions of the dip angle and seam thickness. At the same time, the model also lets us make good use of the methods of AddRegion, AddExtrudeSolidAlongpath, Rotate3D and others to set up the visualized model of 3D roadway. In addition, we have also well-programmed the form of exploitation by means of VBA so as for the computer to automatically give out the drilling parameters by putting different basic parameters in the necessary form via program-running. In correspondence with the layout drilling parameters, the exploitation can also be done in a visual graph of roadway drilling and coal-cutting in CAD, whose output can be done in an Excel form. Thus, the concluded visual graphs and layout parameters turn out to be very close to the actual condition, which means that the geometric model we have developed can serve as a reference to the designers of such gas drainage drilling practice.